I won an item in Stonecore, but it disappeared from the boss and no one got it?

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1

I won an item earlier, Gurthalak, Voice of the Deeps, in Stonecore.
When I left the dungeon I noticed that it wasn’t in my bags.
I rolled a 76, 2 others rolled 36 and 20 something.
I did make a ticket but I just expect the automatic answer of “We can’t see in the server logs that anyone won the item.”
How does this happen? If I did win the item, and didn’t loot it, it’s supposed to come through the postmaster in the mail, but nope.

2

I’d like to add that it disappeared from the boss, and no one else got it.